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Gas Reseroir Prediction And Evaluation Of Daxing Conglomerate In Langgu Depression

Posted on:2012-12-07Degree:DoctorType:Dissertation
Country:ChinaCandidate:L S WangFull Text:PDF
GTID:1100330332488750Subject:Geophysical Engineering
Abstract/Summary:PDF Full Text Request
With the improvement in the exploration and development of exploration technology, the submarine fan conglomerates in the steep slope of Langgu faulted lake basin,which is of subtle reservoir characteristics, has becomes key of the point for exploration and evaluation in Huabei Oilfield. Such conglomerate has been a worldwide technical problem because of its complex geological conditions. As the main reservoir of deep natural gas, Daxing conglomerate in Langgu depression is difficult to identify because of its deep bury, fast phase transformation. The progress of exploration and evaluation is slow because the reservoir body is controlled by submarine fan and phase distribution. As the second three-dimensional seismic acquisition has been carried out in this area in recent years, data quality has improved. Thurthermore, the significant differentiation of vertical wave speed and wave impedance between conglomerate and mudstone becomes the geophysical basis for the integrated application of a variety of evaluation methods to reduce the risk of exploration. It is significant carry out recognition of the whole northern part of the deep Jizhong gas exploration and development of great significance using the means of synthesis of existing geological, logging and seismic data, reservoir specific prediction of conglomerate. Therefore, the research on natural gas exploration and development is both necessary and very timely.In this paper, the study on reservoir characteristics and distribution of gas development law are carried out using the existing geological, geophysical and seismic theory, logging and other advanced technology. The main achievements in this paper are as below:1. Objectives through the conglomerate preserved amplitude prestack timemigration processing and high-resolution frequency extension processing, significantly improving the quality of three-dimensional seismic data, a clearer outline of conglomerate;2. Methods used to carry out seismic sedimentary conglomerate identification, restoration Antiquities raised source Daxing conglomerate ancient geological evolution and the ancient landscape pattern during the deposition, the establishment of Jiuzhou - Gu'an two main areas of conglomerate sedimentary model;3. Daxing fault downthrown on different sub-conglomerate of fine stratigraphic sequence was established stratigraphic framework of conglomerate fine;4. Integrated application of conventional logging and multi-array acoustic logging data logging conglomerate to carry out identification, Daxing conglomerate established criteria for the classification and the gas crack identification method and illustrated;5. Crack formation mechanism introduced by the stress singularity analysis and simulation method to predict fracture situation. By attenuation, AVO attribute processing and analysis, integrated reservoir prediction of gas and crack situation, the favorable evaluation of the basis for potential targets. A variety of information, reflection, and improve the reliability of prediction.Successfully guide the practical application of field Xing 9 assessment of gas to improve the drilling results, the scale of natural gas reserves found in pack conglomerate aged, practice. It has shown that make full use of existing geological and seismic data, the development of technology conglomerate reservoir prediction system, which can effectively solve the problem of evaluation of Daxing conglomerate prediction.
Keywords/Search Tags:DaXing conglomerate, impedance inversion, seismic reservoir prediction, origin and distribution of fractures, gas reservoir evaluation
PDF Full Text Request
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